Telescopic jack



Nov. 15, 1960 H. J. ODONNELL 2,960,303

TELESCOPIC JACK Filed March 18, 1958 2 Sheets-Sheet 1 Iii; if :2; i

1N VE N TOR 1522 31 11 aha 1mm ATTORNEY;

Nov. 15, 1960 H. J. O'DONNELL 2,960,308

TELESCOPIC JACK Filed March 18, 1958 2 Sheets-Sheet 2 INVENTOR ATTORNEYS 2,960,308- TELESCQPIC JACK Henry E. ODonn'ell, 15223 Milford Road, Holly, Mich. Filed Mar. 18, 19s s,'ser.No. 722-,2sa

1 Claim. (31. 2544s scoping jack of the class described above in which a vertically moving screw is supported ina vertically adjustable nut secured by a cam to a base.

A still further object of the invention is to provide a jack of the class described above which is inexpensive to manufacture, simple to use, and which is positive in its action.

Other objects and advantages will become apparent in the following specification whenconsidered in the light of the attached drawings, in which:

Figure 1 is a perspective view of theinvention. I

Figure 2 is an enlarged fragmentary vertical crosssection taken along the line 22 of Figure 1, looking in the direction of the arrows.

Figure 3 is a fragmentar top plan view of the invention.

Figure 4 is a perspective view of a modified form of the invention.

Figure 5 is an enlarged fragmentary vertical crosssection taken along the line 55 of Figure 4, looking in the direction of the arrows.

Figure 6 is a horizontal cross-section taken along the line 66 of Figure 5, looking in the direction of the arrows.

Referring now to the drawings in detail wherein like reference characters indicate like parts throughout the several figures, the reference numeral 10 indicates generally a telescoping jack constructed in accordance with the preferred form of the invention.

The telescoping jack 10 includes a generally circular base 11 having an upstanding annular flange 12 integrally formed on the peripheral edge thereof. Three support rods 13 have their lower ends secured at 14 to the base 11 adjacent the flange 12. The support rods 13 converge inwardly and have offset upper end portions 15 extending parallel to each other.

An elongated nut 16 is positioned intermediate the parallel end portions 15 and welded thereto as at 17 with the axis of the nut 16 perpendicular to the base 11. An elongated threaded shaft 18 is threaded through the nut 16 and is provided with an annular collar 19 fixedly secured thereto in right angularly extending relation with respect to the axis of the threaded shaft 18. The collar 19 is positioned above the nut 16 and is provided with a plurality of upstanding ears 20 integrally formed on the peripheral edge of the collar 19. The shaft 18 has an enlarged upper end portion 21 provided with an annular groove 22.

A cap 23 engages the upper end of the enlarged portion 21 and has a plurality of depending fingers 24 engaging in the annular groove 22 securing the cap 23 to the enlarged portion 21 for swivel movement thereon.

An elongated handle 25 is bifurcated at one end to provide a pair of spaced parallel arms 26.

In the use and operation of the preferred form of the invention illustrated in Figures 1 through 3', the jack 10 is placed b'eneath'one corner of a trailer or other object to be raised, and the handle 25 is positioned with the arms 26 engaged on opposite sides of the shaft 18 between the collar'19 and the enlarged upper end portion 21, in engagement with the collar 19, as best shown in Figure l. 1

The handle 25 engages loosely on the shaft 18 and can be swung upwardly to clear the ears 20 in one direction and swung downwardly to engage the ears 20 during rotation in the opposite direction so that the collar 19 and shaft 18 can be rotated with respect to the nut 16 by a ratcheting action of the handle 25. The cap 23 engages the work and remains stationary 'thereagainst with the enlarged portion 21 swivelling therein. The jack 10 is lowered by reversing the action of the handle 25 to turn the collar 19 in the opposite direction.

Referring now to Figures 4 through 6, a modified form of the invention is illustrated consisting of a jack indicated generally at 30x The'jack 30' has a generally circular horizontal base plate 31 with an integral flange 32 projecting upwardly from the peripheral edge thereof.

A hollow standard indicated generally at 33 is centrally positioned on the base 31 and welded thereto at 34. The hollow standard 33 is generally rectangular in horizontal cross-section and includes a pair of spaced parallel upright walls 35, 36 connected by a second pair of spaced parallel walls 37, 38.

The walls 36, 37 have their upper edges 39, 40 respectively tapering outwardly and downwardly toward the walls 38, 35 respectively. The upper edges of the walls 35, 33 are positioned in the same plane as the edges 39, 40 so that the standard 33'is evenly truncated beginning at a point of the intersection of the walls 36, 37 and tapering downwardly to the intersection of the walls 35, 38.

A tubular hollow body 41 is arranged within the standard 33 in sliding contact with the walls 35, 36, 37 and 38, as can be seen in Figure 6. A pin 42 extends transversely through the lower end of the body 41 and projects outwardly on opposite sides thereof into a pair of opposed corners of the standard 33, looking the body 41 against rotation with respect to the standard 33.

A set screw 43 having a knob 44 on the outer end thereof is threaded through one corner of the standard 33 in overlying relation to one end of the pin 42 to serve as a stop limiting the upward movement of the body 41 in the standard 33, and by binding against the body 41 serving to lock the body 41 against sliding movement with respect to the standard 33.

The hollow body 41 has a reduced diameter threaded bore 45 at the upper end thereof serving as a nut to threadably receive an upright threaded shaft 46.

The threaded shaft 46 has an enlarged upper end portion 47 formed with an annular groove 48 extending thereabout. A cap 49 is loosely engaged over the upper end portion 47 and has a plurality of depending fingers 50 engaging in the groove 43 supporting the cap 49 thereon for swivelling movement with respect to the enlarged upper end portion 47 of the shaft 46.

An annular collar 51 extends perpendicularly to theaxis of the shaft 46 and is welded thereto at 52 adjacent to but spaced below the enlarged upper end portion 47. The annular collar 51 has a plurality of upstanding in tegral ears 53 extending upwardly from the peripheral, edge of the collar 51.

A handle 54 is bifurcated at one end to provide a pair of spaced apart parallel arms 55 engaging on opposite sides of the shaft 46 above the collar 51 and below the enlarged upper end portion 47, in engagement with the collar 51, as best shown in Figures 4 and 5.

A generally. rectangular shaped locking ring plate 56 is provided with a bore 57 having a diameter slightly larger than the external diameter of the body 41 to permit the locking ring plate 56 to bind against the body 41, as shown in Figure 5, when one end of the locking ring plate 56 engages against the highest point of the upper edges 39, 40.

In the use and operation of the modification illustrated in Figures 4 through 6, the body 431 is moved by hand upwardly out of the standard 33 until the cap 49 en gages the work or the pin 42 engages the set screw 43. With the body 41 in its highest position, the locking ring plate 56 is engaged against the upper edges 39, 44) of the standard 33 and causes the bore 57 to lock against the outer surface of the body 41.

The handle 54 is then positioned with the arms 55 engaged over opposite sides of the shaft 46 in a position so that the handle 54 can engage one of the ears 53. By rotating the handle 54 the threaded shaft 46 can be rotated with respect to the threaded bore 45 of the body 41 to move the cap 49 upwardly against the load.

After the handle 54 has been moved as far as is convenient, it is returned by tilting it upwardly to the position shown in dotted lines in Figure 5, and then rotating it in a reverse direction so that it moves past the ears 53 without engagement therewith. The handle. 54 is then lowered to engage another ear 53 to move the shaft 46 an additional amount with respect to the threaded bore 45. The jack 30 may be lowered by exactly reversing the raising steps described above.

Having thus described the preferred embodiments of the invention, it should be understood that numerous additional modifications and adaptations may be resorted to without departing from the scope of the appended claim.

What is claimed is:

A telescoping jack comprising a base, a threaded nut having an axis perpendicular to said base positioned in spaced relation above said base, means extending up wardly from said base supporting said nut in vertically spaced relation thereto, said means comprising a hollow standard fixed to said base in upstanding relation, said nut comprising a hollow tubular internally threaded body slidably telescoped in said standard, a locking ring plate having a bore of greater diameter than said body engaged over said body and supported by the upper end of said standard, said locking ring plate. being tiltable to bind against said body and support said body in adjusted relation to said standard when tilted in angular relation to said body, a pin extending through the lower end of said body, a set screw mounted in said standard and extending inwardly thereof to engage said pin to limit the upward movement of said body, a threaded shaft threadably mounted in said body, a cap journalled on the upper end of said threaded shaft for engaging work to be lifted, an annular flat disk-like collar fixed to said shaft and lying in a plane extending perpendicularly to the axis of said shaft, a plurality of upstanding ears integrally formed on the peripheral edge of said collar in circumferentially spaced apart relation, and a bifurcated handle having a pair of spaced apart parallel arms extending from one end thereof engaging on opposite sides of said shaft above said collar with said handle engaging said ears for rotating said collar and said shaft therewith, said collar supporting the bifurcated end of said handle and guiding said arms in embracing engagement with said shaft.

References Cited in the tile of this patent UNITED STATES PATENTS 256,002. Joyce Apr. 4, 1882 317,951 OHara May 12, 1885 632,197 Olsen Aug. 29, 1899 1,451,661 Crockett Apr. 10, 1923 FOREIGN PATENTS 485,804 Great Britain May 25, 1938 722,819 Great Britain Feb. 2, 1955 

